Malicious PDF — malware analysis report

Static analysis result for SHA-256 3904ac5e17ae0b00…

MALICIOUS

PDF

74.3 KB Created: 2021-03-28 05:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3a04625d3583146bfb166c2cbe2f026f SHA-1: df62c033016357ce28b6095dd7362a0421b3ca77 SHA-256: 3904ac5e17ae0b00dddd967b53d97768b31bd0bf040cc6687f0fae63da35fdb2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to potentially harmful websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/award?keyword=clinically+significant+drug+interactions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422385/normal_601cd247298ec.pdfIn PDF document text
    • http://vostokzapad.su/andhra_pradesh_spandana_application_formruux2.pdfIn PDF document text
    • http://meetraisins.club/dell_optiplex_790_ram_upgraded9pmi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497093/normal_6020c215af871.pdfIn PDF document text
    • http://freud.icu/418085668063me95.pdfIn PDF document text
    • http://damvglaz6.xyz/el_coronel_no_tiene_quien_le_escriba_teatro_valenciat2r7g.pdfIn PDF document text
    • http://naturfresh.space/why_is_my_sunbeam_electric_blanket_blinking_on_high4s7a2.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/bJVbbJV/vosanimirejufimetop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370543/normal_5fe05fffc2aac.pdfIn PDF document text
    • http://womenita.fun/9001_iso_2015_quality_manual_pptphe34.pdfIn PDF document text
    • http://akvatehnika74.ru/definition_of_protected_health_information_45_cfrnmlwn.pdfIn PDF document text
    • http://yozi.store/458757077584db18.pdfIn PDF document text
    • https://cdn.sqhk.co/vizebika/jjjUjcg/vitologeti.pdfIn PDF document text
    • http://tehnikator.ru/lonoturuxanew7na.pdfIn PDF document text
    • https://cdn.sqhk.co/simixejazir/gJNhjW6/play_store_game_jio_phone_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368471/normal_5fc5b63699e9b.pdfIn PDF document text
    • https://cdn.sqhk.co/lijuwezasip/RpT1Vjh/new_york_sightseeing_tours_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414487/normal_602a1c10412e3.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/97335701458pjmkb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/464a0e8a-6af1-4f20-bfeb-75d5daf61c89/mechanics_of_materials_3rd_edition_craig_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7742f1ae-f148-4547-bf4f-5a5b5bb07996/kumiwabisoragepaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86191e9-f1e1-4f50-abc2-a0c1db21928f/how_to_start_freelancing_programming.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 5328 bytes
SHA-256: b98d27f1e7b4b8ed86612233b92840486a946b22391d073f9d234ed18637e3de
font_01_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 10780 bytes
SHA-256: e507ef5f9855a966328c73e1233a00e3742e811c2066df63a8aca3b255ebc3f8

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